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Message-ID: <20130107204220.GB12363@hansolo.jdub.homelinux.org> Date: Mon, 7 Jan 2013 15:42:20 -0500 From: Josh Boyer <jwboyer@...hat.com> To: gregkh@...uxfoundation.org, stern@...land.harvard.edu Cc: laurent.pinchart@...asonboard.com, mdharm-usb@...-eyed-alien.net, linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org Subject: USB autosuspend vs. URB submission Hi, We've had a few reports in Fedora of users hitting the WARN_ONCE in drivers/usb/core/urb.c that prints a warning about a usb_submit_urb being called on an active URB. One of them[1] is from the ums_realtek driver and the other[2] is from the uvcvideo driver. However, I noticed that in both instances it seems the devices were coming back from what I think is autosuspend. I didn't immediately find any similar reports, and to my rather inexperienced eyes the drivers didn't seem to be doing anything clearly wrong. I'm wondering if anyone has some possible ideas for debugging and whether or not this might be a general issue? The backtraces can be found in the bugs. I've ommitted them here for brevity, but if someone hates bugzilla that much I'd be happy to send them along. josh [1] https://bugzilla.redhat.com/show_bug.cgi?id=889286 [2] https://bugzilla.redhat.com/show_bug.cgi?id=879462 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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